From 623def43b2ae0cd23ecef6688257c540e3118856 Mon Sep 17 00:00:00 2001
From: Roland Reichwein <mail@reichwein.it>
Date: Wed, 1 May 2024 18:07:05 +0200
Subject: Added dependencies calculation (WIP)

---
 xmake.cpp | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/xmake.cpp b/xmake.cpp
index e5f85ac..e4cadfb 100644
--- a/xmake.cpp
+++ b/xmake.cpp
@@ -6,6 +6,7 @@
 #include <sstream>
 #include <stdexcept>
 #include <string>
+#include <unordered_map>
 #include <vector>
 
 #include <boost/property_tree/ptree.hpp>
@@ -70,7 +71,7 @@ namespace {
 
  void build(const pt::ptree& ptree) {
   fs::path target{get_target(ptree)};
-
+  std::vector<fs::path> objects{get_objects(ptree)};
   std::vector<fs::path> sources{get_sources(ptree)};
 
   std::cout << "Target: " << target << std::endl;
@@ -80,6 +81,16 @@ namespace {
    std::cout << "  " << i << std::endl;
   }
 
+  std::unordered_map<fs::path, std::vector<fs::path>> dependencies;
+  dependencies.emplace(target, objects);
+  for (const auto& p: sources) {
+   fs::path p_obj{p};
+   p_obj.replace_extension("o");
+   dependencies.emplace(p_obj, std::vector<fs::path>{p});
+   // TODO: add headers dependencies:
+   // g++ -MM -MF <depsfile> -c <cppfile>
+  }
+
   std::vector<std::string> commands;
   // compile
   for (auto &p: sources) {
@@ -90,9 +101,8 @@ namespace {
    }
   }
   // link
-  std::vector<fs::path> objects{get_objects(ptree)};
-  std::vector<fs::path> dependencies{sources};
-  if (is_outdated(target, dependencies)) {
+  std::vector<fs::path> deps{sources};
+  if (is_outdated(target, deps)) {
    std::string link_command{"g++"};
    for (auto &i: objects) {
     link_command += fmt::format(" {}", i.string());
@@ -174,7 +184,6 @@ int xmake(int argc, char* argv[])
    exit(1);
   }
 
-
  } catch (const std::exception& ex) {
   std::cerr << "xmake: " << ex.what() << std::endl;
   return 1;
-- 
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